Hammer



FIG. 1 is a front view of a hammer;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear perspective view thereof.

Any broken lines shown in the Figures are for illustrative purposes onlyand form no part of the claimed design.

The ornamental design for a hammer, as shown and described.